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The Herschel view of GAS in protoplanetary systems (GASPS): first comparisons with a large grid of models

Pinte, C.; Woitke, P.; Ménard, F.; Duchêne, G.; Kamp, I.; Meeus, G.; Mathews, G.; Howard, C. D.; Grady, C. A.; Thi, W.-F.; Tilling, I.; Augereau, J.-C.; Dent, W. R. F.; Alacid, J. M.; Andrews, S.; Ardila, D. R.; Aresu, G.; Barrado, D.; Brittain, S.; Ciardi, D. R.; Danchi, W.; Eiroa, C.; Fedele, D.; de Gregorio-Monsalvo, I.; Heras, A.; Huelamo, N.; Krivov, A.; Lebreton, J.; Liseau, R.; Martin-Zaïdi, C.; Mendigutía, I.; Montesinos, B.; Mora, A.; Morales-Calderon, M.; Nomura, H.; Pantin, E.; Pascucci, I.; Phillips, N.; Podio, L.; Poelman, D. R.; Ramsay, S.; Riaz, B.; Rice, K.; Riviere-Marichalar, P.; Roberge, A.; Sandell, G.; Solano, E.; Vandenbussche, B.; Walker, H.; Williams, J. P.; White, G. J. and Wright, G. (2010). The Herschel view of GAS in protoplanetary systems (GASPS): first comparisons with a large grid of models. Astronomy and Astrophysics, 518 L126/1-L126/5.

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DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1051/0004-6361/201014591
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Abstract

The Herschel GASPS key program is a survey of the gas phase of protoplanetary discs, targeting 240 objects which cover a large range of ages, spectral types, and disc properties. To interpret this large quantity of data and initiate self-consistent analyses of the gas and dust properties of protoplanetary discs, we have combined the capabilities of the radiative transfer code MCFOST with the gas thermal balance and chemistry code ProDiMo to compute a grid of ≈300 000 disc models (DENT). We present a comparison of the first Herschel/GASPS line and continuum data with the predictions from the DENT grid of models. Our objective is to test some of the main trends already identified in the DENT grid, as well as to define better empirical diagnostics to estimate the total gas mass of protoplanetary discs. Photospheric UV radiation appears to be the dominant gas-heating mechanism for Herbig stars, whereas UV excess and/or X-rays emission dominates for T Tauri stars. The DENT grid reveals the complexity in the analysis of far-IR lines and the difficulty to invert these observations into physical quantities. The combination of Herschel line observations with continuum data and/or with rotational lines in the (sub-)millimetre regime, in particular CO lines, is required for a detailed characterisation of the physical and chemical properties of circumstellar discs.

Item Type: Journal Article
Copyright Holders: 2010 ESO
ISSN: 1432-0746
Keywords: astrochemistry; circumstellar matter; protoplanetary disks; star formation; radiative transfer
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 25081
Depositing User: Ann McAloon
Date Deposited: 02 Dec 2010 16:50
Last Modified: 15 Nov 2012 09:53
URI: http://oro.open.ac.uk/id/eprint/25081
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